研究目的
Examining the intrinsic radiation characteristics of a Boost-Glide Vehicle (BGV) under the condition of various Angles of Attack (AOAs).
研究成果
The AOA significantly affects surface temperatures and infrared radiances of the hypersonic vehicle. Under steady conditions, higher AOAs increase temperatures on the lower surface and alter radiation intensities depending on spectral bands and observation angles. Transient simulations show that the rate of AOA change influences radiance variations over time, with effects more pronounced in certain views and bands. Future work should include multi-species gas radiation in high-temperature flows.
研究不足
The study assumes no ablation and ignores atmospheric transmission and attenuation in radiation calculations. Only CO2 is considered as a radiating species in the gas phase. The computational domain is simplified to a half-cylinder, and initial conditions are based on equilibrium at α=0°, which may not fully represent real flight scenarios. Grid sensitivity and model assumptions (e.g., constant emissivity) could introduce errors.
1：Experimental Design and Method Selection:
The study uses numerical simulations based on computational fluid dynamics (CFD) and radiative transfer models. A two-temperature model for thermal and chemical non-equilibrium is coupled with Navier-Stokes equations solved using the finite volume technique. A gas-solid conjunction heat transfer model is integrated to simulate surface temperatures. The radiative transfer equation is solved with the Line of Sight (LOS) algorithm.
2：Sample Selection and Data Sources:
The Hypersonic Technology Vehicle-2 (HTV-2) type vehicle is used as the computational model. Freestream conditions are selected from references, including altitude of 50 km, velocity of 5400 m/s, and AOAs ranging from 0° to 30°.
3：0°. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Computational software and models are used, including custom CFD solvers and radiation codes. Specific equipment includes the use of ICEM-CFD for mesh generation.
4：Experimental Procedures and Operational Workflow:
Steady-state simulations are performed at AOAs of 0°, 10°, and 20°. Transient simulations are conducted with time-varying AOAs at angular velocities of 1°/s and 2°/s. The flow field and radiation are computed iteratively with time steps of 2×10^-5 s.
5：0°. Transient simulations are conducted with time-varying AOAs at angular velocities of 1°/s and 2°/s. The flow field and radiation are computed iteratively with time steps of 2×10^-5 s. Data Analysis Methods:
5. Data Analysis Methods: Results are analyzed for surface temperatures, heat fluxes, and infrared radiances in spectral bands (MWIR: 3-5 μm, LWIR: 8-12 μm, and others). Comparisons are made between different AOAs and observation angles.
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